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The biggest benefit I see to dimensional analysis is that it means you only have to know ONE process. Other ways teach you multiple different formulas to learn. And - while we think we’ve done a pretty good job breaking that down for you in the basics of calculations lesson, we still believe that having only one way to do things every time is way better! The other benefit is that dimensional analysis works for all types of calculations - simple, complex, weight based, lots of conversions or super straight forward - it still works! And there’s no need to do any separate conversions or rounding in the middle of the process. Everything happens with ONE final calculation. We’re going to talk you through the process of dimensional analysis with the same problem we used in the Basics of Calculations lesson, then I’m going to show you how it work for simple AND complex problems by working a few out. In the other med math lessons on the different types of problems, we will use this method, because we honestly feel like it’s the best way to go.
So when you start dimensional analysis, you always start with what you’re looking for and build your equation from there. So let’s read this problem. The provider orders 60 mEq of KCl IV to be given over 4 hours. The bag contains 100 mEq in 1 L of NS. What is the rate you should set on the pump? So first things first - identify our variables - what are we looking for? Setting a rate on an IV pump always means mL per hour - so write that here, then write an equals sign because we’re going to be setting up an equation. Okay - step 1 - start with what you’re looking for.
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